Microsoft Outlook and Multiple Services Experience Widespread Outage

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Microsoft Outlook email and several related services suffered a widespread outage, affecting users worldwide with no clear cause yet explained by Microsoft.

On November 12, 2026, Microsoft's Outlook email service encountered a significant outage that prevented both business and consumer users globally from accessing their inboxes. Initially reported in the U.S. and Americas, the issue rapidly expanded to impact users in all regions. Microsoft has not disclosed a specific root cause but indicated that "a large number of servers being unexpectedly unavailable" is responsible, without further elaboration.

The company has been actively managing the situation by redistributing connection traffic across its global infrastructure to balance the load, which was described as "elevated." Updates were provided through official channels, though some administrative portals were temporarily inaccessible during the event.

Alongside Outlook, several other Microsoft services experienced disruptions, including its video conferencing tool Teams, file sharing platform SharePoint, AI assistant Copilot, and the Defender XDR security system. Consumer-facing services such as OneDrive storage and Office Online were also unavailable throughout the outage.

This incident follows a prior major disruption in September 2026, when Microsoft 365, including Outlook, was offline for several days due to a "core authentication configuration" error. As of now, Microsoft continues to investigate the current outage and has not provided a definitive explanation or estimated time for full recovery.

The widespread impact of this outage underscores the reliance on cloud-based productivity and security services, highlighting the challenges large technology providers face in maintaining continuous service availability across diverse platforms.